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I was wondering the other day how many unspent transaction outputs there are ?
If you just keep track of the unspent transaction outputs you could import private keys, know its balance and perform spends. How much data is this compared to the full blockchain ?
The biggest downside is that you would not have the full transaction list for a private key/address - just the transactions that you can use for future transaction inputs.
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As of block 177778 (Apr 29, 2012 6:17:33 PM):
3A less time-specific answer to the question "How many unspent transaction outputs are there?" would be appreciated. – Steven Roose – 2013-06-14T22:01:04.870
Looking at the number of addresses with nonzero balance, an index versus 'list of blocks address has an unspent tx output in' I calculate would be less than 28 MB. It would then be quick to get the blocks from bitcoind and hence the key's transactions. – jim618 – 2012-04-29T18:43:04.047
2Would a script that reports these numbers be available anywhere? – Stephen Gornick – 2012-04-29T20:59:33.717
I calculated it using a patch for bitcoind that scans the blockchain at startup, not very user-friendly :) – Pieter Wuille – 2012-04-30T00:53:42.760
@StevenRoose The number isn't fixed, so an answer would have to be "time-specific." – Geremia – 2017-05-13T03:35:29.850
Where/how did you obtain this info? – Geremia – 2017-05-13T03:37:05.930
https://blockchain.info/unconfirmed-transactions – abelenky – 2017-05-20T21:12:54.173